added time to 'Last Updated' message

I've used here `stringForObjectValue:` instead of `stringFromDate:`
because it's given as explanation of NSDateFormatter's class method
`localizedStringFromDate:dateStyle:timeStyle:` in apple docs.
FormatterBehavior I've also set as it given in that method.
[#11]
Compile-time check for iOS 6 compatibility

dispatch_release() is forbidden for ARC–code in iOS 6 — removing it is safe.
'dependency' is deprecated (use `pod')
Merge pull request #17 from f1fe/master

Documentation update
Use weak delegate.
I feel like there was a reason I didn't do this before, but I can't remember.
Support default top inset better
Merge pull request #13 from yas375/issue-11

added time to 'Last Updated' message
Got rid of unused NSDateComponents variable and unnecessary return on a void method
Merge pull request #19 from garrettstj/master

Got rid of unused NSDateComponents variable and unnecessary return on a void method
Add `pullToRefreshView:didUpdateContentInset:` delegate method
Merge pull request #16 from alanzeino/master

iOS 6 forbids dispatch_release() when using ARC.
1.0.2
feature: scrollView will not scroll when setting insets if the content size is larger than the scrollview itself.

Force scrolling the scrollView if scrollView is already at the top.
Throw an exception when you add a pull to refresh view to a scroll view twice
Update Readme.markdown
Add correct check for ARC support for GCD objects
Merge pull request #21 from density/arcfix

Add correct check for ARC support for GCD objects
Fix typo in GCD ARC check macro
Merge pull request #22 from density/arcfix

Fix typo in GCD ARC check macro
Merge pull request #15 from mspasov/feature-scroll

feature: make the scrollView scroll to top and show the contentView